Which description of the RPF check in the multicast forwarding traffic is true?

Which description of the RPF check in the multicast forwarding traffic is true?
A . The source address of the multicast packet is checked in the unicast routing table. If the multicast packet arrived from the interface that matches with the interface to reach the source address, this packet passes the RPF check.
B . The destination address of the multicast packet is checked in the BGP database. If the multicast packet arrived from the interface that mate with the interface to reach BGP peer that advertised the mutlicast prefix, this packet fails the RPF check.
C . The source address of the multicast packet is checked in the unicast routing table. If the multicast packet arrived from the interface that matches with the interface to reach the source address, this packet fails the RPF check
D . The unicast address of the multicast packet is checked in the BGP database. If the multicast packet arrived from the interface that matches with the interface to reach BGP peer that advertised the multicast prefix, this packet passes the RPF check

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Answer: A